@Susie34 You really want your guests to do this and not you. Sometimes if you do a custom refund, airbnb will still do their own refund, so the guests will be refunded twice. Just tell the guests to contact airbnb, give their extenuating circumstances and cancel. You can tell them to tell airbnb to contact you and confirm that you are fine with the cancellation and full refund. I really would not do anything on your end though.